Authorities said they've determined what caused a house to explode Wednesday.

Rescue crews were called to the home near 78th Street and Crown Point Avenue around 12:30 p.m. Wednesday. Firefighters found the house torn apart by a fire, and battled flames from a distance because of a natural gas leak which resulted from the explosion.

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Investigators said the explosion, which came from the back porch, was related to the manufacturing of fireworks.

Medics took Brad Vanzago to Creighton University Medical Center in critical condition. Vanzago's son was not seriously hurt, but stayed at the hospital overnight for observation. Vanzago's wife was not hurt in the blast.

Brad's father, Scott Vanzago, told KETV NewsWatch 7 that Brad lost a hand, an eye and part of one foot. In addition, he suffered a broken leg and more than half of his body has second-degree burns.

A fund has been set up for the Vanzagos at Wells Fargo.

911 Calls Released

Authorities released the 911 calls from the incident on Thursday.

In one call, a woman is heard saying she was taking a nap while her husband was "working on something."

She described the scene, saying her "whole house is almost exploded" and there was "insulation everywhere."

A 911 dispatcher tries to calm her down, assuring her help is on the way.

She said her husband was trapped inside "underneath all the house and everything."

In other 911 calls, neighbors reported hearing the explosions and seeing smoke coming from the home.